Final answer:
Donna is the person motivated by an intrinsic factor, as she takes up mountain climbing out of a love for the challenge, not for any external reward. Intrinsic motivation comes from internal fulfillment, and while extrinsic rewards can influence it, the effect is nuanced.
Step-by-step explanation:
The person motivated by an intrinsic factor is Donna, who begins mountain climbing to overcome her fear and for the love of the challenge, despite being afraid of heights. Intrinsic motivation comes from within, as it is driven by personal satisfaction or the joy of doing something, rather than by external factors such as rewards or pressure. We see that with Donna, who challenges herself not for any external reward, but for internal fulfillment. Conversely, Roberto, Kim, and Jean are motivated by extrinsic factors as they are aiming for outcomes like promotions and grades, rather than personal enjoyment or interest.
Studies indicate that intrinsic motivation can be influenced by external reinforcement. For instance, if an individual begins to get paid or receive other extrinsic rewards for something they were originally driven to do from intrinsic motivation, their motivation might shift, and they may no longer find the activity fulfilling in the absence of the extrinsic reward. However, certain types of external reinforcement, such as verbal praise, might enhance intrinsic motivation, depending on the context and how it is received. Hence, the interplay between intrinsic and extrinsic motivations is complex and can involve a delicate balance.